Movies(500) Days of SummerA Good YearShaun of the DeadThe Elephant ManStraight StoryHot FuzzCasino RoyaleLost HighwayDate NightTropic Thunder8 MileThe ExorcistRe-AnimatorRecThis is Spinal TapPonyo on the Cliff by the SeaPulp Fiction

I don't know how to give tips on how to make good icons because I have never been asked before :P But I'll try my best! First of all, I need to say that I don't think my graphics are good enough (seeing other makers whose graphics are beyond gorgeous) but I know I have improved :P Here are the things that helped me:

Photoshop CS3 (obviously :D) (though I have CS4 now)

Finding tutorials (but you shouldn't do the same things they do, you should add things and play with images)

coloringtuts or iconmakeit have some useful tutorials (of course you need to eliminate the bad ones, there are plenty :P)

And of course, there's the quality of images. You should work with hq's. The bigger the better :P I rarely use the caps I took because they look really bad. Also you should be careful when you sharpen an image, it sometimes makes the image even worse. There are communities like toxic_caps or site galleries like youknowyouloveme which provide high quality screencaps :)